Brookfield Thermosel with EZ-Lock - Manual (Page 9)

Brookfield Engineering Laboratories, Inc. Page 9 Manual No. M09-208
4. Using a syringe, graduated cylinder, or other suitable measuring device, pour into the sample
chamber the volume of liquid sample specified on the range table in Appendix A.
5. Using an extracting tool, put the filled sample chamber back into the thermo-container by
rotating the chamber until it drops and locks in place.
6. Lower the viscometer and align the thermo-container.
7. Connect the spindle, extension link and coupling nut (S-23K). Lower the spindle into the
chamber. Raise the spring-loaded sleeve at the base of the viscometer and insert the cou-
pling nut (S-23K). Slide the sleeve back down to hold the spindle in place. Check that the
liquid level is approximately 1/8 inch above the conical surface on the spindle shaft. Do
not overfill.
8. Replace the insulating cap.
9. Turn on the temperature controller and adjust the set point to the desired temperature.
NOTE: The set point temperature will be denoted by a steady display on the con-
troller, along with the steady flashing of the heater “ON” light.
One option for sample materials that are not thixotropic or pseudoplastic
is to turn ON the viscometer motor and leave it running during the equi-
librium period. The rotating spindle provides agitation which helps reduce
temperature equilibrium time and temperature gradients within the test
sample.
10. After the thermo-container, spindle, chamber, and test sample have reached temperature
equilibrium, viscosity readings at different speeds may be obtained.
Samples That Are Not Liquid At Ambient Temperature
There are several alternative approaches toward testing samples that are solid or semi-solid at am-
bient (room) temperature. The main concerns are: First - safety; Second - keeping test material
IN the sample chamber and OUT OF the thermo-container "well." The thermo-container can be
preheated without the sample chamber and test material if desired.
The following steps are recommended for taking viscosity measurements of test samples that are
liquid only at elevated temperatures.
1. The instrumentation should be assembled without the insertion of the sample chamber,
spindle, and insulator cap.
2. Set the controller to the desired temperature.
3. Weigh into the sample chamber the amount of test sample which in the liquid state will
be equivalent to the test volume required. It is helpful to know the density of the sample
material.
4. Place the sample chamber into the thermo-container and proceed, following the steps out-
lined for liquid samples at ambient temperature, starting on Page 6.